Stuffing-box for rotary parts.



W. FRITZ. STUFFING BOX FOR ROTARY PARTS.

APPLICATION FILED SEPT. '7, 1909.

Patented 0 ct.17,19 11.

Wifnesses W WALTER FRITZ, F BERLIN, GERMANY.

STUFFING-BOX FOR ROTARY PARTS.

Specification of Letters Patent. Patented Oct. 17, 1911.

Application filed September 7, 1909. Serial No. 516,573.

To all whom it may concern:

Be it known that I, WALTER FRITZ, a subject of the German Emperor, and resident of Berlin, Germany, have invented certain a new and useful Improvements in Stuffing- Boxes for Rotary Parts, of which the following is a s ecification. V My invention 1 relates to means for acking shafts-and other rotary v parts 0 mam chinery and has for its object toprovide a tight joint without any undue friction and heating of the parts thereby avoiding the dangers due to heated bearings and shafts."

It is well known that the expansion due to the heating of rotary parts tendsto force them more tightly against the packing surfaces, thereby increasing the friction and causing a further rise of temperature which is liable to reach a dangerous point. This is especially the case with machinery rotating at high speed. According to my present invention, the packing is arranged within the surface on which it rubs during the rotation of the. part of machinery and the member 'which-surrounds the packing is free to expand outwardly.

My invention may be applied either with the packing stationary or connected with the rotary member so-as to share-its rotation.

In each case the surrounding sleeve or stuffing box will expand outwardly thereby reducing the pressure between the stufiing box and the packing and causing a decrease of temperature owing to the reduced friction.

The stufling box will thus automatically .a'd-

just itself' to the-proper diameter at which the temperature of the rotary member remains practically constant. There is, therefore, no danger of the shaft or bearing-be- 40 coming overheated or of the shaft becoming jammed tight in,its bearings.

- In the accompanying drawings I have illustrated several different forms of my invention, Figures 1, 2 and 4; being longitudinal sections, Fig. 3 a partial peripheral seetion, and Fig. 5 a cross section of the construction shown in Fig. 4.

t In Fig. 1 the packing a which may be made of any approved material isseoured to the shaft Zrso as to rotate in unison there-- with. To the stationary member 0 through which it is intended to have the shaft 12 ass "tightly, I have. secured a sleeve or stu ing box 0 in such a manner that it will engage the packing a but will'not turn therewith. sleeve, at the region engaged by the located at the ends. I "better construction, I prefer in such cases to packing, has suflicient play in an outward directionv as indicated at f to allow for its expansion under the influence of increasing ment with the outer surface of the packing a. In this second structure, also, the sleeve d is free to expand outwardly when its diameter increases owing to heating. t

In both of these constructions the packing a is arranged in an annular space. In view of the fact that friction between the sleeve and thefpacking tends to turn or twist the latter relatively to the shaft in Fig. l or to the stationary member in Fig. 2, it is advlsable to provide means for holding the packing against circumferential movement relatively to the part carrying it. This may be accomplished in the manner illustrated by Fig. 3 where the side surfaces 9 of the mug between which the,packin is held are provided with projections Z tting corresponding recessesof the packing and pre venting its relative movement in the direc t'lon of rotationjndicated by the arrow '5.

When the packing rotates with the shaft as in Fig. 1,- it is subject to the influence of centrifugal force which, would tend to increase the friction by throwing the packing outward. Th is may be prevented by suithere should be held individually against movement both radial and circumferential by 'means of the character above set forth. When the packing rings are simply stacked in engagement w1th one another, 1t is very diflicult to obtainthis result, for the reason that the rings nearest the center are held either by the cylindrical surface of the stuffing box or through the medium ofthe rings In order. to obtain a any radial or circumferential movement of the packing rings relatively to the spacing.

rings. An example of such a construction is illustrated by Figs. land 5. Here I have shown four packing rings a in conjunction with three interposed spacing'rings m which are provided with ridges is to prevent a radial movement of the packing rings and also with projections h to prevent a circum-' ferential movement of said rings. Each of the rings on is provided with a feather 0 fitted into a suitable groove provided in the outer surface of a sleeve 9 held to rotate with the shaft 6 as by means of a key 8.

It is desirable to provide for tightening the packing, especially when it is of an elastic or soft character; Thus in Fig. 1 a nut p is providedfor this purpose. When several packing rings are employed as in Fig. 4, it is diflicult to tighten them uniformly by merely exerting pressure on the end ring, since friction would cause most of the pressure to come on the end ring and those adjacent to it. Fig. 4 shows an arrangement in which the rings m are mounted to move in unison with the sleeve q when the nut p is tightened so that a uniform pressure will be exerted on each of the packing rings a. It will be understood that the sleeve 9 is mounted to slide lengthwise on the outer surface 9" of the shaft.

In some constructions provision has to be made for a lateral movement of the shaft. In such cases the stufi'ing box must comprise a laterally yielding member capable of following the shaft in its lateral movement. This may be obtained by arranging the non-rotary part of the stuffing box so that it can slide or move in a direction perpendicular to the axis of the shaft as shown in Fig. 1. Here the sleeve d which does not rotate is capable of sliding radially on the surfaces t of the stationary member a and can thus follow the motion of the shaft should it be flexed. When the packing is non-rotary as in Fig 2, the packing itself with its carrier at is movable radially on the guiding surfaces t on the stationary member c. In each case, of course, suitable con- Y structions must be provided to prevent the transversely sliding member from being outer surface of the packing, said sleeve being free to expand outwardly.

2. The combination, with a stationary member and a rotary member, of a packing carried by one of said members and engaging the other member, and a sleeve surrounding the packing and free to expand outwardly. I

3. The combination, with a stationary member, and a rotary member,of a packing carried by one of said members and engaging the other member, and a sleeve surrounding the packing and free 'to expand outwardly, and means for preventing circumferential displacement of the packing relatively to the member carrying it.

4. The combination with a stationary member and a rotary member, of a packing carried by one of said members and engaging the other member, and a sleeve surrounding the packing and free to expand outwardly, and means for preventing radial displacement of the packing relatively-\to the member carrying it.

5. The combination, with a stationary member and a rotary member, of a packing carried by one of said members and engaging the other member, and a sleeve surrounding the packing and "free to expand outwardly, and means for preventing circumferential and radial displacement of the packing relatively to the member carrying it. v 6, The combination, with a stationary member and a rotary member, of a plurality of packing rings carried by one of said members and engaging the other member, a

sleeve surrounding the packing and free to expand .Joutwardly, and axially movable spacing rings interposed between adjacent packing rings.

7. The combination, with a stationary member and a rotary member, of a sleeve I carried by one of saidmembers, a plurality of packing rings carried by the other of said members and engaging the inner surface of the sleeve, said sleeve surrounding the packing and free to expand outwardly, and axially movable spacing rings interposed between adjacent packing rings and provided with means for holding the pack-' ing rings.

8: The combination, with a stationary member and a rotary member, of a sleeve carried by one of said members, a packing carried by the other of said members and engaging the inner surface of the sleeve,

said sleeve surrounding the packing and free to expand outwardly, and means for compressing the packing to tighten the joint.

9. The combination, with a stationary member, and a rotary member, of a sleeve carried by one of said members, a packing carried by the other of said members and engaging the inner surface of the sleeve, 'said sleeve surrounding the packing and free to expand outwardly, and a compressing sleeve mounted to slide axially and provided with means for compressing the pack- 1n %0. The combination with a stationary member and a rotary member, of a sleeve carried by one ofsaid members, a packing carried by the other of said members and engaging the inner surface of the sleeve, said sleeve surrounding the packing and free to expand outwardly, the non-rotary section of the joint thus formed being movable transversely of the axis of rotation to allow for a flexing of the rotary member.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

' WALTER FRITZ.

Witnesses WOLDEMAR' HAUPT, HENRY HABPER. 

